Just FYI - I thought about using Costco for tires recently. I have used them for batteries, in the past, but for one reason or another, usually they did not stock what I wanted, not for tires. Had to put tires on wife's car and was looking at a tire there. I called local tire dealer and they were much cheaper. I was very surprised. Same tires, but much better price. as usual, your mileage may vary.
As for tires - I tend to believe that when God invented 4WD, he intended they have A/T tires. I have run everything from Wrangler GSA (complete crap) to BF Goodrich A/T KO.
I really like what I will call the "light duty all-terrain" tire. An example is the Bridgstone Dueler REVO, the tread is quiet, but aggressive enough for boat ramps, snow etc. I also tend to put a lot of miles on my trucks, so I want the tires to perform well on road.
I had really good luck with Goodrich step down from the TAKO, the Rugges trail. Had two sets, first went 80K, second were on truck 70K later when sold. Great highway manners, but did well in snow and limited off road use on gravel roads with trailers etc. They were LR E tires.
I currently have the much vaunted Michelin AT2 on my truck. Came with them. They are nice and quiet on road. That is the only positive thing I can say. Compared to other tires, they are horrible on boat ramps, gravel roads etc. I cannot wait to wear them out.
My favorite truck tire is the Hankook Dynapro AT/M. It looks pretty aggressive, but rides and wears more like a street tire. Ran those on my last truck, and honestly if they had been the right size would have swapped them out when traded for current truck. Now that I have 8K miles on the Michelins, REALLY miss my Hankooks. They were great in snow, good all around. After 75K miles they still had 40% tread.
2013 Coachmen Freedom Express 320BHDS pulled by a 2005 F250 King Ranch CC
A rainy day camping is better than a sunny day at work.